The former president and first lady have signed with Penguin Random House, the publisher announced Tuesday. Financial terms were not disclosed, although the deal is likely in the tens of millions of dollars.

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The unique duel arrangement is for books that are among the most anticipated in memory from a former president and first lady. Barack Obama is widely regarded as the one of the finest prose stylists among recent presidents, and Michelle Obama has given few details about her time as first lady. Both are widely popular with the public in the U.S. and abroad.

A bidding war has broken out between several prominent book publishers, according to a person involved in the sale process, but Penguin appeared to have a built-in advantage since it published the former president's past books.